Circuit breakers are designed to trip around 50% of rated nameplate DC voltage. This specification is extremely important when several circuit breakers are required to trip simultaneously (as in bus differential faults) because the battery supply voltage drops due to the heavy current demand for these operations.

The Barrington PS20 Direct Current Power Supply is used to determine the minimum voltage and current required to operate the circuit breaker. Its filtered output has very low ripple and it has an adequate current capacity to fully simulate the battery supply for tripping purposes.

The PS20 can also be used as an emergency battery charging system and to determine the minimum operating conditions for DC motors, relays and auxiliary equipment.